Night & Extreme Conditions

5 free sample questions of the 35 in this topic. The full set is in the app.

1. Question 1

   Night driving is more dangerous mainly because:

   • A.Drivers can't see hazards as quickly, leaving less time to respond
   • B.Engines run cooler at night
   • C.Speed limits are higher
   • D.There is more traffic
   Show answer & explanation

   Answer: A. Drivers can't see hazards as quickly, leaving less time to respond

   Hazards appear later at night, so response time shrinks — the problems span driver factors, roadway factors, and vehicle factors.

   Source: California Commercial Driver Handbook (DL 650) — §2.11.1 — Night driving is more dangerous

2. Question 2

   If your license has a corrective-lenses restriction, you must:

   • A.Wear them whenever you drive — even short distances
   • B.Wear them only at night
   • C.Carry them but wear them at your discretion
   • D.Renew the restriction annually
   Show answer & explanation

   Answer: A. Wear them whenever you drive — even short distances

   It's illegal to move a vehicle without your corrective lenses if your license requires them — and keep a spare set in the vehicle.

   Source: California Commercial Driver Handbook (DL 650) — §2.11.2 — Driver factors: vision

3. Question 3

   Tinted corrective lenses at night are:

   • A.A bad idea — they cut the light you need to see clearly
   • B.Recommended against glare
   • C.Required for commercial drivers
   • D.Fine if lightly tinted
   Show answer & explanation

   Answer: A. A bad idea — they cut the light you need to see clearly

   Avoid dark or tinted lenses at night even if they seem to help with glare — they reduce exactly the light night vision depends on.

   Source: California Commercial Driver Handbook (DL 650) — §2.11.2 — Driver factors: vision

4. Question 4

   Two seconds of glare blindness at 55 mph means traveling:

   • A.More than half the length of a football field
   • B.About one truck length
   • C.About 50 feet
   • D.Less than a city block... so it's harmless
   Show answer & explanation

   Answer: A. More than half the length of a football field

   Glare recovery can take several seconds; even two seconds blind at 55 mph covers more than half a football field.

   Source: California Commercial Driver Handbook (DL 650) — §2.11.2 — Driver factors: glare

5. Question 5

   Fatigue affects driving the way:

   • A.Alcohol and drugs do — it impairs vision and judgment
   • B.Cold weather does
   • C.A heavy load does
   • D.Loud music does
   Show answer & explanation

   Answer: A. Alcohol and drugs do — it impairs vision and judgment

   Fatigue — from strain, repetitive tasks, illness, or lost sleep — impairs vision and judgment just like alcohol and drugs.

   Source: California Commercial Driver Handbook (DL 650) — §2.11.2 — Fatigue and lack of alertness

30 more Night & Extreme Conditions questions are in the app, along with explanations and flashcards for every one.

OnRoute is an independent study aid based on the federal CDL standards (49 CFR Part 383), the FMCSA Entry-Level Driver Training theory curriculum (49 CFR Part 380 Appendix A), and related Federal Motor Carrier Safety Regulations. It is not affiliated with, endorsed by, or sponsored by the FMCSA, AAMVA, or any state driver licensing agency. CDL knowledge tests are administered by your state, and state-specific requirements may vary — always consult your state's CDL manual.